avoid displaying more messages when the list is not yet initialized
fix meeting form end hour combobox list display #LINQT-2127
check if at least one participant when creating group chat #LINQT-2134
display all the errors at a time if they all occur #LINQT-2133
add signal to add chat to list when state Created #LINQT-2131
fix chat deletion
* Normalize and correct linphone color
* Add border when user focus using keyboard navigation
* Correct some keyboard navigation
* Add accessibility screen reading to interactive elements except chat and meeting
